Search found 65 matches

by jas67
Jan 26 2023 6:44am
Forum: Battery Technology
Topic: Tool for making slots in nickel or copper strip
Replies: 1
Views: 35

Tool for making slots in nickel or copper strip

What tool are you all using for cutting slots for welding?

I'd think some sort of punch tool that cuts a 10mm X .5mm slot would be ideal. Google hasn't been much help finding one.

Thanks all!
by jas67
Jan 25 2023 6:27am
Forum: Items Wanted
Topic: 72v battery - looking for the smallest 20ah-30ah out there
Replies: 7
Views: 133

Re: 72v battery - looking for the smallest 20ah-30ah out there

I do not think you'll get below 15 lbs for 30ah.
I have a 32ah 72V pack made from 4ah 21700 cells (20s8p), it weighs about 30 lbs with BMS.

You can probably figure on about 1 pound per 1ah for a 20s pack.
by jas67
Jan 25 2023 6:21am
Forum: Battery Technology
Topic: Battery connection method
Replies: 14
Views: 299

Re: Battery connection method

You could probably recover 50-75% of the cost of the K-weld by selling it when you're done making your pack. I'm sure there are some here who would happily purchase a lightly-used K-weld for a discount. I know that I would've (I bought one new recently). The K-weld is a brilliant piece of kit. I had...
by jas67
Jan 02 2023 7:52am
Forum: EScooter/EMotorcycle Build Threads
Topic: Kawasaki Ninja 250 build
Replies: 22
Views: 386

Re: Kawasaki Ninja 250 build

The engine on these bikes is a stressed-member. The battery frame on this build will not serve as a stress member. It would be MUCH better to weld it up with chrome-moly tubing, and add some diagonal bracing. It might be necessary for said bracing to bolt on one side to allow installing and removal ...
by jas67
Dec 01 2022 7:56pm
Forum: Battery Technology
Topic: Daly BMS Problem (150A/72V 20S)
Replies: 2
Views: 110

Re: Daly BMS Problem (150A/72V 20S)

I have the same DALY problem with FET shutoff. I saw it happen when the temperature dropped below 8C, but when back in the garage at 16C the motorbike worked again. I'm still investigating why. It is possible to connect a PC program called PC master, you can then read more parameters and update the...
by jas67
Nov 27 2022 6:59pm
Forum: Battery Technology
Topic: Daly BMS Problem (150A/72V 20S)
Replies: 2
Views: 110

Daly BMS Problem (150A/72V 20S)

I have a Daly 150A/20S BMS on my EV converted Vespa "VespaLectric" . The last time I tried to ride it, I switched on the main switch, tried to go, and lost all power. Long story short, looking at the bluetooth app, it appears that the charge and discharge FETs are both shutting off like th...
by jas67
Nov 27 2022 6:51pm
Forum: Battery Technology
Topic: ADVICE -Replacing/Repairing DeWalt Battery Packs.
Replies: 6
Views: 222

Re: ADVICE -Replacing/Repairing DeWalt Battery Packs.

Looking at how rusty the interconnect strips are, those are NOT pure nickel, but, steel.
That is probably why they're thick, because, steel is much less conductive than nickel.
by jas67
Oct 28 2022 12:43pm
Forum: EScooters/EMotorcycles
Topic: Upgrading a 1500w engine for higher top speed
Replies: 5
Views: 276

Re: Upgrading a 1500w engine for higher top speed

The 4000W QS hub motor (don't know the model off the top of my head), check this build thread: https://endless-sphere.com/forums/viewtopic.php?f=10&t=109761&start=150 on my E-vespa can do 100kph no problem. It can sustain that. Power consumption at that speed on a flat with no wind is about ...
by jas67
Oct 23 2022 12:38pm
Forum: Motor Technology
Topic: New QS138 90H V3
Replies: 6
Views: 647

Re: New QS138 90H V3

I like it. I wonder how much power these can take for bursts.
I have a "4000W" QS hub motor in my Vespa. It tolerates several second long bursts up to 15,000W.

If I had the free time, I'd love to put this motor in a Ninja 250 or similar sized motorcycle.
by jas67
Oct 10 2022 5:05am
Forum: EScooter/EMotorcycle Build Threads
Topic: Jerry Can Mini Electric Motorcycle
Replies: 16
Views: 1600

Re: Jerry Can Mini Electric Motorcycle

Up around 60mph it feels like death is right around the corner with 12 inch wheels My Vespa P125X EV conversion is nice and stable up to its max speed of 62 MPH on 10 inch wheels. I also have a Vespa GTS250ie that has 12 inch wheels; it is nice and stable up to its max speed of 75 MPH. I think mayb...
by jas67
Sep 17 2022 6:27am
Forum: Battery Technology
Topic: 10ohm 10w resistor for 72v battery
Replies: 3
Views: 229

Re: 10ohm 10w resistor for 72v battery

999zip999 wrote: ↑
Sep 16 2022 6:11pm
Thank you it's for a pre-charge resistor to plug in the main. I was looking for the math.
It should be fine for that.
by jas67
Sep 16 2022 6:37am
Forum: Battery Technology
Topic: 10ohm 10w resistor for 72v battery
Replies: 3
Views: 229

Re: 10ohm 10w resistor for 72v battery

What are you trying to do with said resistor?

If you're using it for a test load, you'll need a much higher wattage resistor.

72V / 10ohm = 7.2A

72V * 7.2A = 518 Watt.
by jas67
Sep 16 2022 6:04am
Forum: EScooters/EMotorcycles
Topic: Vespa PX125 (Large Frame) Electric Conversion.
Replies: 222
Views: 21374

Re: Vespa PX125 (Large Frame) Electric Conversion.

The second battery will be in addition to the current battery, or will it replace it? Addition. I'm doing it for multiple reasons. One, as that by sharing the load between the two, each battery will provide roughly half the current. This way sag due to internal resistance of the battery will be hal...
by jas67
Sep 02 2022 8:49am
Forum: EScooter/EMotorcycle Build Threads
Topic: 1950 Scooter EV-Conversion
Replies: 49
Views: 2255

Re: 1950 Scooter EV-Conversion

120bA * 72V = 8,640W, over double the continuous rated power of my 4KW motor, so, no, I don't agree that I just as well could've used a smaller motor. I tend to run it continuously at 4-5 KW. ery. You can go wayyyyy over that, don't worry. My 2000W motor on the scooter takes 210 battery Amps and 51...
by jas67
Aug 31 2022 9:21pm
Forum: EScooter/EMotorcycle Build Threads
Topic: 1950 Scooter EV-Conversion
Replies: 49
Views: 2255

Re: 1950 Scooter EV-Conversion

Nice pic of the scoot! Beautiful scoot! What size wheels/tires does it have? I love the spoke front wheel, very classy. I also love the front disc brake. My Vespa conversion still has the lame front drum. It has 12 inch wheels. Front is a 1.85x12 with a 3.00x13 Heidenau tire Rear is a 3.5x12 rim wi...
by jas67
Aug 31 2022 7:19pm
Forum: EScooters/EMotorcycles
Topic: Vespa PX125 (Large Frame) Electric Conversion.
Replies: 222
Views: 21374

Re: Vespa PX125 (Large Frame) Electric Conversion.

I very much enjoy the sound and character of my various motorcycles, especially the vintage ones. But, there is something magical about the vibration-free silence of the electric Vespa, and the only sound being the wind. I usually use it as my errand running vehicle, but, this evening, I took it for...
by jas67
Aug 31 2022 4:44pm
Forum: EScooter/EMotorcycle Build Threads
Topic: 1950 Scooter EV-Conversion
Replies: 49
Views: 2255

Re: 1950 Scooter EV-Conversion

MDG wrote: ↑
Aug 31 2022 1:27pm
Nice pic of the scoot!
Beautiful scoot!

What size wheels/tires does it have?
I love the spoke front wheel, very classy. I also love the front disc brake. My Vespa conversion still has the lame front drum.
by jas67
Aug 31 2022 10:56am
Forum: EScooter/EMotorcycle Build Threads
Topic: 1950 Scooter EV-Conversion
Replies: 49
Views: 2255

Re: 1950 Scooter EV-Conversion

So in this thread: https://endless-sphere.com/forums/viewtopic.php?t=93794 He goes based of 20 WH per mile. Again, I know it’s all relative but is this number dependent on what exactly? Is it speed or battery info? What would a typical WH/mile be on a EV scooter or small moto you think? 80-100 wh p...
by jas67
Aug 30 2022 6:45pm
Forum: EScooter/EMotorcycle Build Threads
Topic: 1950 Scooter EV-Conversion
Replies: 49
Views: 2255

Re: 1950 Scooter EV-Conversion

9 mile ride today! Scoot feels good. I tuned it down a bit to help with range a bit. How does one calculate range estimate? I have a 72v 30AH battery So..72x30=2160watt hours. From here, how do I determine my WH per mile to get me range? You're best off just doing it empirically. Ride it, monitor s...
by jas67
Aug 30 2022 5:50am
Forum: Battery Technology
Topic: Honeycomb 21700 Cell Holders -- looking for source
Replies: 13
Views: 497

Re: Honeycomb 21700 Cell Holders -- looking for source

Hope I shared here help some of you building your packs. Yes, that was all very helpful. I need to up my CAD game so I can make the files for laser cutting. I'll have to dig around and see what shops in my local area can offer that service. As my time is quite limited, I'm not adverse to spending m...
by jas67
Aug 29 2022 4:37pm
Forum: Battery Technology
Topic: Honeycomb 21700 Cell Holders -- looking for source
Replies: 13
Views: 497

Re: Honeycomb 21700 Cell Holders -- looking for source

A punch tool to make slots on Ni or Cu sheet is what a lot of us have been looking for. I have long searched for it until I quitted. Do let me know if you come across one. I'm thinking something like this: https://www.amazon.com/Eastwood-Gauge-Classic-Sheet-Metal/dp/B085HZYS3M/ref=sr_1_1_sspa?crid=...
by jas67
Aug 29 2022 12:20pm
Forum: Battery Technology
Topic: Honeycomb 21700 Cell Holders -- looking for source
Replies: 13
Views: 497

Re: Honeycomb 21700 Cell Holders -- looking for source

Wow, I like those laser-cut copper plates. kWeld now went into deep hibernation. Uh oh? Does that mean I can't or shouldn't get one? I have a Sunkko 709A, which won't do 0.2mm nickel reliably without slotting it. I'm looking for a device to punch slots, but, haven't found one yet. I'd love to have a...
by jas67
Aug 28 2022 2:05pm
Forum: Battery Technology
Topic: Honeycomb 21700 Cell Holders -- looking for source
Replies: 13
Views: 497

Re: Honeycomb 21700 Cell Holders -- looking for source

Not long after printing this cell holders & some other parts, I sent my Voron2.4 (3D printer) to a friend to upgrade/mod and do not expect it to be back in about a month. It will be a Rev2, reliable and fast. I really enjoy using it. I can help you with the CAD design during my free time, and i...
by jas67
Aug 28 2022 7:58am
Forum: Battery Technology
Topic: Honeycomb 21700 Cell Holders -- looking for source
Replies: 13
Views: 497

Re: Honeycomb 21700 Cell Holders -- looking for source

Actually, you can make your own cell holders any size, any shape you like. 3D CAD, 3D printer, appropriate filament. I use PA-CF (Nylon Carbon-fiber upto β‰ˆ100 deg C working temp) for my 2 identical(mirror?) packs * 20S3P of Samsung21700-40T. They are durable, light, fit perfectly with cells, fun to...